Dice Probability Calculator

Exact PMF/CDF for dice expressions like 2d6+1, d20, 4d8-2. Client-side; no uploads.

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Expression

Grammar: [N]dS [+/- K]. Examples: d20, 3d6, 2d10-1. (No exploding/advantage yet.)

Stats

Distribution

Bars are relative to the maximum point probability.

Principle: exact arithmetic with integer counts (BigInt) when possible; converts to probabilities at render time.